<template>
<div>{{obj.message}}</div>
    
</template>
<script setup>
import { reactive } from 'vue' 
const obj = reactive({message:'hello world'})
 setTimeout(()=>{
    console.log('之前的信息'+obj.message);
    obj.message = 'hello vue'
     console.log('之后的信息'+obj.message);
},1000)

</script>
